On Tue, 28 Jul 2015 09:04:44 +0200 mattia sowdust@autistici.org wrote:

I've been running a middle relay [1] for months and I have always noticed an unbalance between incoming and outgoing connections (monitored through arm). The incoming connections were always in between 0-10% more than the outgoing ones.

This morning though the unbalance has reached so far unseen levels: arm reports more than 2500 incoming connections while outgoing are little more than 200.

Is this normal and, if so, why?

Your relay has the HSDir flag, so most likely what happened is that you became one of the HSDirs for a popular hidden service (use your imagination as to which one, there's a few that cause a lot of traffic).

I wouldn't worry about it that much.

Regards,